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Microchip Technology 93LC66BT-I/MC
- Part No.:
- 93LC66BT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93LC66BT-I/MC.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
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Product details
Overview
93LC66BT-I/MC from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS/CLK/DI/DO), and industrial temperature range (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - deployed in embedded system configuration storage.
For engineers reviewing the 93LC66BT-I/MC datasheet, 93LC66BT-I/MC pinout, 93LC66BT-I/MC application, or 93LC66BT-I/MC equivalent, key selection criteria include VCC range (2.5–5.5 V), 8-bit x512 memory map, DFN-8 package footprint, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers in space-constrained industrial designs.
Technical Context
The 93LC66BT-I/MC implements a synchronous serial interface with start-bit detection, opcode-driven command set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and dual-mode memory access: standard single-byte operations and bulk functions (ERAL/WRAL) requiring ≥4.5 V for execution. Its internal logic includes address counter, mode decode, and output buffer with high-impedance DO during standby.
It supports sequential read without reissuing address, uses rising-edge clocking for all data transfers, and enforces strict timing windows (e.g., TCSL ≥250 ns, TCKH/TCKL voltage-dependent minima). The ORG pin is NC on this 'A'-type variant, fixing 8-bit word size and eliminating external configuration logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit) - fixed x8 organization; no ORG pin required. |
| VCC Range | 2.5 V to 5.5 V - supports wide-input industrial rails; POR threshold at 1.5 V prevents corruption during brown-out. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware. |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or logging updates in field-deployed equipment. |
| Data Retention | >200 years at +25°C - ensures long-term firmware parameter integrity without refresh. |
| Write Cycle Time | 6 ms typical (TWC) - deterministic self-timed programming allows precise host timing budgeting. |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for use in motor drives, PLC I/O modules, and HVAC controls. |
| Package | 8-lead 2×3 mm DFN (MC) - exposed pad option enhances thermal dissipation in compact PCB layouts. |
Pinout & Package
8-lead 2×3 mm DFN package (MC suffix), RoHS-compliant Matte Tin finish, with exposed thermal pad (may be connected to VSS or left floating per design requirements).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must remain low ≥250 ns between commands; initiates self-timed write on falling edge for 93LC66A/B variants. |
| 2 CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clock required during auto-erase/write cycle. |
| 3 DI | Data Input | Accepts start bit, opcode, address, and data; tied to DO in shared-bus configurations (requires series resistor to avoid conflict). |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS falls; status valid only after ≥250 ns CS low time. |
| 5 NC | No Connection | Internally unconnected; must be left floating or tied to ground per layout best practice (no functional impact). |
| 6 ORG | Organization Select | No internal connection on 93LC66A devices - pin is unused; not bonded; ignore in schematic and layout. |
| 7 VSS | Ground | Primary reference for all I/O and core logic; connect directly to low-impedance ground plane. |
| 8 VCC | Power Supply | 2.5–5.5 V supply; decoupling capacitor (0.1 µF) required within 5 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or polling delay loops - host asserts CS low and waits for DO high or timeout. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; removes requirement for separate erase command in firmware flow. |
| Power-On/Off Data Protection | Hardware-level lockout below 1.5 V VCC prevents partial writes during power ramp-up/down - no software safeguards needed. |
| Ready/Busy Status via DO | Enables efficient polling without dedicated status lines; reduces pin count and simplifies interface to resource-limited MCUs. |
| Sequential Read Mode | Allows continuous address increment with single READ command - cuts transaction overhead by ~40% vs. repeated addressing. |
| Pb-free & RoHS Compliant | Matte Tin (Sn) finish meets global environmental regulations; compatible with lead-free reflow profiles (J-STD-020). |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in pressure transmitters operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year retention and 1M-cycle endurance for periodic recalibration. Use Value: Eliminates battery-backed SRAM; avoids data loss during power interruption and reduces BOM cost by 30% vs. FRAM alternatives. | Use Scenario: Holding boot-time configuration flags (e.g., COM port baud rate, display brightness, network MAC address) in programmable logic controllers. IC Role / Device Role / Timing Role: Microwire-compatible serial EEPROM interfaced to legacy 8-bit MCU with no hardware SPI peripheral. Use Value: Enables field-upgradable settings without firmware modification; supports secure write-protection via EWEN/EWDS commands. |
| Automotive Subsystem Logging | Consumer Appliance State Memory |
Use Scenario: Recording fault codes and runtime counters in HVAC control modules within automotive E-marked industrial-grade enclosures. IC Role / Device Role / Timing Role: Industrial-temp EEPROM used in non-safety-critical subsystems where AEC-Q100 Grade 2 is sufficient. Use Value: Meets extended temperature and reliability requirements without premium automotive-grade pricing; supports diagnostic readout via CAN gateway. | Use Scenario: Saving user preferences (e.g., cooking mode, timer presets, child lock status) across power cycles in smart microwave ovens. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during short wake-up bursts from deep-sleep MCU states. Use Value: Achieves sub-1 µA standby current (ICCS ≤1 µA) - extends battery life in backup-powered UI modules by >5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-I/MC | 16-bit x256 organization; same VCC range, package, and timing; ORG pin unused but present (NC). | Requires host firmware adaptation for 16-bit word access; incompatible with existing 8-bit address/data handling logic. | Select only if system architecture mandates 16-bit bus efficiency and memory map alignment justifies firmware rewrite. |
| AT25040B-MAHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, SOIC-8 package; lacks ERAL/WRAL bulk commands and DO status pin. | Needs dedicated SPI peripheral; no hardware-ready indication - requires fixed 5 ms delay or software polling loop. | Choose when migrating to SPI-based platforms and board space permits SOIC-8; verify timing margins for worst-case 1.8 V operation. |
Compared with 93LC66B-I/MC, the 93LC66BT-I/MC offers native 8-bit compatibility and eliminates ORG pin routing complexity; versus AT25040B-MAHL-T, it delivers deterministic status feedback and Microwire legacy support - critical for cost-sensitive industrial MCU designs without SPI peripherals.
Availability
93LC66BT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and consumer appliance state memory requiring stable component supply across multi-year production lifecycles.
Supply support for 93LC66BT-I/MC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets globally.
The 93LC66 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage without SPI hardware dependency.
FAQ
What is the memory organization of the 93LC66BT-I/MC?
The 93LC66BT-I/MC is an 'A'-type device with fixed 512 × 8-bit organization. The ORG pin is not internally connected and plays no role in memory configuration - unlike 'C'-type variants, no external logic is needed to select word size. This simplifies PCB layout and firmware development for 8-bit data paths.
Does the 93LC66BT-I/MC require an external pull-up resistor on the DO pin?
No, the 93LC66BT-I/MC does not require an external pull-up on DO. The pin actively drives high/low during read or status reporting and enters high-impedance (High-Z) when inactive. However, if DI and DO are wired together (shared bus), a series resistor (typically 100–470 Ω) is mandatory to prevent bus contention during the dummy-zero phase of read operations.
What is the minimum VCC required for reliable operation of the 93LC66BT-I/MC?
The 93LC66BT-I/MC has a power-on reset (POR) threshold of 1.5 V. Below this voltage, all operations are inhibited to prevent data corruption. Valid operation begins at 2.5 V, with full specification compliance across the 2.5–5.5 V range - including AC timing, endurance, and data retention metrics.
Can the 93LC66BT-I/MC be used in automotive applications?
The 93LC66BT-I/MC is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-hood environments, it is not qualified to AEC-Q100 standards. For automotive use, Microchip recommends the 93LC66B-E/MC or 93LC66C-E/MC variants, which are explicitly tested and marked for extended temperature operation.
How does the Ready/Busy status work on the 93LC66BT-I/MC?
The DO pin serves dual purpose: data output during READ and Ready/Busy indicator during erase/write. After initiating a WRITE or ERASE command, bring CS high for ≥250 ns, then sample DO - low indicates ongoing operation, high confirms completion. Issuing a new Start bit followed by CS low clears any pending status, resetting the DO pin to High-Z.
93LC66BT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
93LC66BT-I/MC FAQ
1.How can I place an order for 93LC66BT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-I/MC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 93LC66BT-I/MC reliable?
The price and inventory of 93LC66BT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66BT-I/MC is usually 5 days.
3.What payment methods are accepted for 93LC66BT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-I/MC?
93LC66BT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-I/MC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 93LC66BT-I/MC?
For technical support, including 93LC66BT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-I/MC requirements.
6.How does Aetrix verify that 93LC66BT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-I/MC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 93LC66BT-I/MC meets industry standards.
7.What is the process for return or replacement of 93LC66BT-I/MC?
All 93LC66BT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-I/MC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 93LC66BT-I/MC part is unused and in its original packaging.
Return procedure for 93LC66BT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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